Let's start with a three-dimensional image, after witch you have to connect in your imagination this phenomenon with the next watersoundimages, that give a two-dimensional image of the same kind.

The troughs in the first image are metamorphosed into crests in the second one. The "bridge" between the two crests translate themselves in a line that you see in the two-dimensional images that come next. That is because the top of this ridge reflects the vertical shining light perpendicular to the lens of the camera, just like other regions of the waving watersurface that point out in that direction. This way it should be possible to connect this images by the ones below.

(these images are not taken from the same watersoundproces as those below, so there can be some differences between them; otherwise that should be to easy for you, isn't it?)

An almost still standing pattern, in a very slow metamorphosis between those polar patterns:

Next film also shows a two-sectored water-sound-motion, but notice again that the patterns are different from the ones above, as well as the next ones.

Besides water, we can let oscillate any liquid. Mercury for exemple, is a liquid metal, with strong cohesion (attraction to other mercury-atoms) and weak adhesion (weak attraction to other materials). On a surface it will keep a drop-form, that will change under influence of an oscillation, but will neventheless stick together.